Definitely. You can find them on various fanfiction websites. These fanfictions often play with the idea of their mutual respect for each other's skills, despite their differences. For example, Snape's expertise in potions and McGonagall's in transfiguration, and how that could lead to an interesting dynamic in a story.
Another theme is loyalty. They both have deep loyalty to Hogwarts but express it in different ways. Snape's loyalty is complex and often misunderstood, while McGonagall's is more straightforward. Fanfictions explore how these different loyalties can cause friction between them. In a lot of these stories, their loyalty also brings them together in times of crisis. For instance, when Voldemort's forces threaten the school, they have to find a way to cooperate despite their differences. This exploration of loyalty makes the fanfictions really engaging.
In some fanfictions, their rivalry might be explored in the context of the Hogwarts Houses. For example, McGonagall being a proud Gryffindor and Snape a Slytherin. There could be a story where they have to resolve a conflict between the two Houses, and their different approaches to the situation create a lot of tension and drama.
There's also 'Snape and McGonagall: A Different Perspective'. This fanfic delves into a more complex relationship between them. It starts with a simple encounter and then builds on their shared experiences at Hogwarts, including their different views on teaching and protecting the students. It's a really engaging read.
One common theme is the clash of personalities. Snape is often portrayed as brooding and secretive, while McGonagall is more straightforward. Their interactions can be full of tension and underlying respect.
The contrast between their characters. Snape is often seen as dark and brooding, while McGonagall is more strict but fair. Their relationship in fanfics can be a study in opposites attracting. It makes for some really engaging and unexpected storylines.
One great 'Snape vs McGonagall fanfiction' is 'The Clash of Professors'. It shows their different teaching styles and how they often butt heads in Hogwarts' corridors. The author does a great job of portraying their personalities as we know them from the original books.
In many fanfictions, they are often portrayed as equally powerful in different ways. McGonagall's strength lies in her traditional magical skills and her leadership, while Snape's strength is more in his unique knowledge and his ability to adapt to difficult situations. So it's not always clear - cut who is stronger.
One common plotline is McGonagall protecting Harry from the Ministry of Magic when they wrongly suspect him of something. For instance, if the Ministry believes Harry is using Dark Magic, McGonagall stands up for him, using her influence and knowledge of Harry's character to prove his innocence.
In most proper Harry Potter fanfiction, McGonagall is a strict but fair character. If Harry were to break school rules in a fanfic, she might punish him as she does in the original books. However, it depends on the plot and the writer's interpretation of her character.